杂交稻抗旱性状的筛选研究

以淹水、旱地试验为处理，通过对9个杂交稻组合主要形态、农艺性状对单株产量的相关、逐步回归、通径和灰色关联分析，筛选出穗茎粗（穗颈节处直径大小）、结实率、谷粒宽和倒1节间长等性状作为南方稻区杂交稻组抗旱性的鉴定指标。根据试验结果，认为在杂交稻抗旱育种上应以选择穗茎粗、多穗多粒、结实率高、谷粒宽、倒1节间长、生育后期进程快、早郭的组合为好。

Screening for Drought Resistance Traits i n Hybrid Rice

Thirty nine agronomic characters of eight groups in nine hybrid rice combinations were surveyed under the treatments of irrigating and dry conditions and the correlation, stepwise regression, path and grey correlative analyses between them and grain yield per plant were conducted to screen for drought resistance characters. The results showed that the traits of panicle neck thickness, seed setting percentage, grain width and length of the first internode from top could be used as the indices for drought resistance identification of hybrid rice. Therefore, the attention should be paid to the selection of the hybrids with such characteristics as thick panicle neck, high seed setting percentage, wide grain, long first internode from top, short late growth stage and early maturity in drought resistance breeding of hybrid rice.